JP4454650B2 - Branch pipe renewal method for fluid piping system - Google Patents

Description

  The present invention maintains a fluid transport in the fluid pipe by connecting a branch pipe having one end connected to a branch base of a fluid pipe such as a water pipe and a gate valve connected to a connecting portion formed at the other end. It is related with the branch pipe renewal construction method of the fluid piping system which updates as it is.

  FIG. 1 shows an example of a structure subject to application of a branch pipe renewal method for a fluid piping system. As shown in FIG. 1, in a fluid piping structure in which an air valve 7 which is an example of a fluid device is attached to a branch system, an example of the fluid pipe A cylindrical branch base pipe 2A having an inner diameter larger than the outer diameter of the branch pipe 5 is integrally formed at a branch equivalent position of the water pipe 1, and a bolt 3 and a nut are connected to the connecting flange portion 2a of the branch base pipe 2A. A branch base 2 for connecting and forming the branch pipe 5 to the water pipe 1 is configured by the branch mouth cover 2B and the branch base pipe 2A.

  One end of the branch pipe 5 is integrally connected by welding or the like to a central portion of the branch base 2B of the branch base 2 that intersects the vertical line Y passing through the pipe axis X of the water pipe 1. The connecting flange portion (an example of the connecting portion) 5a on the other end side of the branch pipe 5 has a connecting flange portion 6a on the lower side (upstream side) of the gate valve 6 in a watertight state via a bolt 3 and a nut 4. In addition, a connection flange portion 7a of the air valve 7 is fixedly connected in a watertight state via a bolt 3 and a nut 4 to the connection flange portion 6b on the upper side (downstream side) of the gate valve 6. (See Patent Documents 1 and 2).

  In such a fluid piping structure, when water leakage occurs at a connecting point between the branching cap 2B of the branching base 2 and one end of the branching pipe 5, it is conventionally provided upstream of the branching point of the water pipe 1. The gate valve is closed to shut off the flow of clean water (fluid), and after the branch cap 2B is removed from the connecting flange portion 2a of the branch base pipe 2A in this water shut-off state, the branch base after the removal The new branch port lid 2B provided with the new branch pipe 5 is fixedly connected to the connection flange portion 2a of the pipe 2A through the bolt 3 and the nut 4 in a watertight state.

JP 2006-349004 A JP 2007-032769 A

  In the conventional branch pipe renewal method of the fluid piping system, since water leakage has occurred at the connection part on the base side of the branch pipe 5, the water leakage treatment is performed on the leaked part with a water stopping member such as water stop rubber or putty. Even if it can be done, it is necessary to eventually shut off the water and replace the branch palate 2B itself provided with the branch pipe 5 with a new one, and there is room for improvement in this aspect.

  The present invention has been made in view of the above-described actual situation, and the main problem is that even when water leakage occurs at the connection portion on the base side of the branch pipe, fluid transport in the fluid pipe is performed. It is the point which provides the construction method which can update a branch pipe in the state which prevented the liquid leak in the middle of construction with maintaining.

According to a first characteristic configuration of the present invention, a branch pipe in which one end is connected to a branch base portion of a fluid pipe and a gate valve is connected to a connecting portion formed at the other end is used for fluid transport in the fluid pipe. A branch pipe renewal method for a fluid piping system that is renewed while being maintained, and includes the following steps 1) to 4).
1) A closing device having a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is connected by the closing part of the closing device inserted through the gate valve in the opened state. Block.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) After dividing the branch pipe at a site downstream of the blocking action position of the blocking section and upstream of the connecting section, the fluid pipe or the branch base is cut into the cutting opening of the remaining branch pipe section after the cutting. A new branch member having a branch connection port that communicates and capable of covering and covering the entire outside of the remaining branch pipe portion is attached in close contact.
4) After connecting the gate valve to the connecting portion formed on the branch connection port side of the new branch member, the blocker of the blocker is removed through the gate valve in the valve open state.

  According to the above characteristic configuration, when leakage occurs at the connection portion between the branch base of the fluid pipe and one end of the branch pipe, the closing device is connected to the gate valve connected to the connection at the other end of the branch pipe. Then, the flow path on the upstream side of the leakage occurrence location in the branch pipe is closed by the closing portion of the closing device inserted through the gate valve in the opened state.

  Next, the gate valve is removed from the connecting portion of the branch pipe while the closing portion of the closing device remains in the branch pipe, and the downstream portion of the closing portion is located upstream of the connecting portion. In the above, the branch pipe is divided, and the projecting distance to the outside of the remaining branch pipe part left on the branch base part side of the fluid pipe is shortened, and at the same time, the pipe diameter is cut by the amount by which the pipe part on the connecting part side is removed. The size in the direction can also be reduced.

  After this dividing step, a new branch member capable of covering the outside of the entire remaining branch pipe portion is attached to the fluid pipe or the branch base portion in close contact, and then the tip of the branch port portion of the new branch member A gate valve is connected to the connecting portion formed in the above, and the closing portion of the closing device that has closed the flow path of the remaining branch pipe portion is removed through the gate valve in the opened state. Thereafter, a fluid device such as an air valve or piping material is connected to the gate valve as necessary.

  Therefore, even when water leakage has occurred at the connection portion on the base side of the branch pipe, it is possible to update the branch pipe while preventing fluid leakage during construction while maintaining fluid transportation in the fluid pipe. In addition, since the remaining branch pipe part from which the connecting part has been cut and removed is covered with the new branch member, the updated branch structure can be made compact.

According to a second characteristic configuration of the present invention, a branch pipe having one end connected to a branch base portion of a fluid pipe and a gate valve connected to a connecting portion formed at the other end is connected to the fluid pipe. A branch pipe renewal method for a fluid piping system that is renewed while being maintained, and includes the following steps 1) to 4).
1) A closing device provided with a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing part of the closing device inserted through the gate valve in the opened state. To do.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) The fluid pipe or the branch base is provided with a branch connection port communicating with the branch port of the branch pipe, and a new branch member capable of covering the outside of the entire branch pipe including the connection portion is in close contact with the fluid pipe or the branch base. Install with.
4) After connecting the gate valve to the connecting portion formed on the branch connection port side of the new branch member, the blocker of the blocker is removed through the gate valve in the valve open state.

  According to the above characteristic configuration, when leakage occurs at the connection portion between the branch base of the fluid pipe and one end of the branch pipe, the closing device is connected to the gate valve connected to the connection at the other end of the branch pipe. Then, the flow path on the upstream side of the leakage occurrence location in the branch pipe is closed by the closing portion of the closing device inserted through the gate valve in the opened state.

  Next, after removing the gate valve from the connecting part of the branch pipe while leaving the closed part of the closing device in the branch pipe, the new branch member attached in close contact with the fluid pipe or the branch base part Since the entire branch pipe including the connecting portion is covered with the branch connection port in communication with the branch port of the branch pipe, processing for the branch pipe is unnecessary, and when the new branch member is attached, Since the main part is completed, the number of construction processes can be reduced.

  After that, a gate valve is connected to the connecting portion formed at the tip of the branch connection port of the new branch member, and the blocking portion of the blocking device that has blocked the flow path of the branch pipe is removed through the valve valve in the opened state. To do. Thereafter, a fluid device such as an air valve or piping material is connected to the gate valve as necessary.

  Therefore, even when water leakage has occurred at the connection portion on the base side of the branch pipe, it is possible to update the branch pipe while preventing fluid leakage during construction while maintaining fluid transportation in the fluid pipe. In addition, since the entire branch pipe provided with the connecting portion is surrounded by the new branch member, the construction period can be shortened by reducing the number of construction steps.

According to a third characteristic configuration of the present invention, a branch pipe having one end connected to a fluid pipe or a branch base connected to the fluid pipe and a connecting valve formed at the other end is connected to the fluid pipe. A branch pipe renewal method for a fluid piping system that is renewed while maintaining fluid transportation in the above-described method, comprising the following steps 1) to 5).
1) A branch sealing member that has a through-hole that can be attached to the outer peripheral surface of the connecting portion, and that can seal the outer peripheral surface side of the branch pipe excluding the connecting surface of the connecting portion, with respect to the fluid pipe or the branch base portion. Are attached in close contact with each other, and the space between the inner peripheral surface of the through hole of the branch sealing member and the outer peripheral surface of the connecting portion is sealed.
2) A closing device provided with a closing portion capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing portion of the closing device inserted through the gate valve in the opened state. To do.
3) The gate valve is removed from the connecting portion of the branch pipe while the closed portion of the closing device remains in the branch pipe.
4) A new branch member that covers the outer side of the branch port of the branch pipe is attached to the branch sealing member in a close contact state with its branch connection port communicating with the branch port of the branch pipe.
5) After connecting the gate valve to the connecting portion formed on the branch connection port side of the newly installed branch member, the closing portion of the closing device is removed through the gate valve in the open state.

  According to the above characteristic configuration, when leakage occurs at the connection portion between the branch base of the fluid pipe and one end of the branch pipe, the gate valve connected to the connection at the other end of the branch pipe is closed. A branch sealing member capable of sealing the outer peripheral surface of the branch pipe excluding the connecting surface of the connecting portion is attached to the fluid pipe or the branch base with the through hole attached to the outer peripheral surface of the connecting portion. At the same time, by sealing between the inner peripheral surface of the through hole of the branch sealing member and the outer peripheral surface of the connecting portion, a sealed space appears outside the branch pipe including the portion where leakage occurs. be able to.

  Therefore, the leakage prevention process can be performed in the sealed space formed by the branch sealing member, and the sealing space for this purpose is advantageously configured in terms of structure and cost by using the connecting portion of the branch pipe. be able to.

Next, a closing device is connected to the gate valve connected to the connecting portion at the other end of the branch pipe, and the flow path in the branch pipe is closed by the closing portion of the closing device inserted through the gate valve in the opened state. After that, the gate valve is removed from the connecting portion of the branch pipe while the closing portion of the closing device remains in the branch pipe.
After this removal step, a new branch member covering the outer side of the branch port of the branch pipe is attached to the branch sealing member in close contact with the branch connection port communicating with the branch port of the branch pipe, A gate valve is connected to a connecting portion formed on the branch connection port side of the new branch member, and the closing portion of the closing device is removed through the gate valve in an open state. Thereafter, a fluid device such as an air valve or piping material is connected to the gate valve as necessary.

  Therefore, even when water leakage has occurred at the connection portion on the base side of the branch pipe, it is possible to update the branch pipe while preventing fluid leakage during construction while maintaining fluid transportation in the fluid pipe. In addition, the leakage prevention process can be reliably and easily performed in the sealed space formed between the outer peripheral surface of the branch pipe and the inner peripheral surface of the branch sealing member, and the sealed space for this purpose is branched. Using the connecting portion of the tube, it can be advantageously configured in terms of structure and cost.

According to a fourth characteristic configuration of the present invention, a branch pipe having one end connected to a fluid pipe and a gate valve connected to a connecting portion formed at the other end is updated while maintaining fluid transportation in the fluid pipe. A branch pipe renewal method for a fluid piping system comprising the following steps 1) to 4):
1) A closing device having a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing part of the closing device inserted through the gate valve in the opened state. Occlude.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) The fluid pipe is divided into a plurality of pipe circumferential directions so that the fluid pipe can be mounted from the outside in the radial direction of the pipe, and one of the divided joint bodies can cover the outside of the entire branch pipe. The new branch joint provided with the branch cylinder part is attached to the fluid pipe in a close contact state with the branch cylinder part covering the outside of the entire branch pipe.
4) After connecting the gate valve to the connecting portion formed in the branch cylinder portion of the new branch joint, the block portion of the block device is removed through the gate valve in the valve open state.

  According to the above characteristic configuration, when a leak occurs at the connection portion between the fluid pipe and one end of the branch pipe, the closing device is connected to the gate valve connected to the connection portion at the other end of the branch pipe, and opened. The flow path on the upstream side of the leakage occurrence location in the branch pipe is closed by the closing portion of the closing device inserted through the valve gate valve.

  Next, after removing the gate valve from the connecting portion of the branch pipe while leaving the closed portion of the closing device in the branch pipe, a plurality of split joint bodies of the new branch joint with respect to the fluid pipe, When the branch tube portion provided in one is attached in an intimate state so as to cover the outside of the entire branch tube, there is no need to process the branch tube, and when the new branch joint is attached Since the main part of the construction is completed, the number of construction processes can be reduced.

  After that, a gate valve is connected to the connecting portion formed at the tip of the branch cylinder portion of the new branch joint, and the closing portion of the closing device that has blocked the flow path of the branch pipe through the gate valve in the opened state is removed. To do. Thereafter, a fluid device such as an air valve or piping material is connected to the gate valve as necessary.

  Therefore, even when water leakage has occurred at the connection portion on the base side of the branch pipe, it is possible to update the branch pipe while preventing fluid leakage during construction while maintaining fluid transportation in the fluid pipe. In addition, since the entire branch pipe provided with the connecting portion is surrounded by the new branch member, the construction period can be shortened by reducing the number of construction steps.

  According to a fifth feature of the present invention, an annular ring formed between the inner peripheral surface of the branch sealing member and the outer peripheral surface of the branch pipe before connecting a gate valve to the branch port portion of the branch sealing member. It is in the point of filling the filler in the sealed space.

  According to the above characteristic configuration, by using a sealed space formed between the outer peripheral surface of the branch pipe and the inner peripheral surface of the branch sealing member, leakage is prevented by filling the sealed space with the filler. Processing can be performed reliably and easily.

  According to a sixth characteristic configuration of the present invention, before connecting the gate valve to the branch port portion of the new branch member, the sixth feature is formed in an annular space between the inner peripheral surface of the new branch member and the outer peripheral surface of the branch pipe. The point lies in filling the filler.

  According to the above characteristic configuration, by utilizing the annular space between the inner peripheral surface of the new branch member and the outer peripheral surface of the branch pipe, the annular space is filled with the filler, thereby ensuring the leakage prevention process. Can be done easily.

[First Embodiment]
FIG. 1 shows a fluid piping structure in which an air valve 7 which is an example of a fluid device is connected to a metal branch pipe 5 of a branch system in the fluid piping system, and is an example of a fluid pipe constituting the fluid piping system. A connecting flange portion 2a of a cylindrical branching base tube 2A formed integrally projecting radially outward in the middle of the water pipe 1 is connected to a branch palate via a bolt 3 and a nut 4 which are examples of fastening means. The branch base 2 for connecting and forming the branch pipe 5 to the water pipe 1 is constituted by the branch cap 2B and the branch base pipe 2A.

  In addition, one end of the branch pipe 5 is integrally formed by welding or the like at a central portion of the branch base lid 2B of the branch base 2 that intersects the branch axis Y perpendicular to the pipe axis X of the water pipe 1. The connecting flange portion 6a on the other end side of the branch pipe 5 (an example of a connecting portion) 5a is connected to the lower (upstream side) connecting flange portion 6a of the gate valve 6 as an example of a fastening means. The bolt 3 and the nut 4 are fixedly connected in a watertight state, and the connecting flange portion 6a of the air valve 7 is connected to the connecting flange portion 6b on the upper side (downstream side) of the gate valve 6 as a fastening means. It is fixedly connected in a watertight state via bolts 3 and nuts 4 as an example.

  Next, in the above-described fluid piping structure, if leakage occurs at a connection location with the branch base 2 of the water pipe 1, the branch pipe 5 is updated while maintaining the water (fluid) transport in the water pipe 1. The branch pipe renewal method for the fluid piping system will be described.

[1] As shown in FIG. 2, the gate valve 6 is maintained in a closed state, and the upper connection flange portion 6b of the gate valve 6 and the connection flange portion 7a of the air valve 7 are fixedly connected. 3. The nut 4 is unlocked and the air valve 7 is removed from the upper connecting flange portion 6b of the gate valve 6.

  Of the plurality of sets of bolts 3 and nuts 4 that are fixedly connected to the connecting flange portion 2a of the branch base tube 2A and the branch port lid 2B, the bolts 3 and nuts 4 at the plurality of column mounting locations are connected to the branch base tube 2A. A nut 4 which is an example of a fastening means is removed by a predetermined set unit capable of maintaining a watertight connection state between the connection flange portion 2a and the branch port lid 2B, and a lower end screw shaft portion of a bolt support column 8 is attached to the removed mounting hole. And the first operating shaft 16 of the closing device B provided with a closing portion (blocking means) A capable of closing the flow path of the branch pipe 5 over the fixed upper portions of the plurality of columns 8. A support arm 10 provided with a fixture 9 for maintaining a closed state at a predetermined insertion position is attached by a nut 4.

  As the closing device B, there are conventionally various types of structures. As an example, as shown in FIGS. 2 to 9, a bolt 3 and a nut are connected to the upper connecting flange portion 6b of the gate valve 6. 4, the bottom wall portion 15b of the bottomed cylindrical closure case 15 provided with a connecting flange portion 15a that is detachably fixedly connected to the center wall of the bottom wall portion 15b is slid in the direction of the branch axis Y in a watertight state. A cylindrical first operation shaft 16 that movably penetrates and a second operation shaft 17 that slidably penetrates in the first operation shaft 16 in the direction of the branch axis Y are provided. 16 and the distal end side of the second operating shaft 17 are provided with a closing portion A for blocking the flow path W in the branch pipe 5, and the operating shafts 16 and 17 are connected to the closing portion A from the outside. There is provided a closing operation means C that is operated via the cable.

  As shown in FIG. 9, the closing portion A includes a first pressing plate 18 having an annular pressing surface 18 a that is fitted and fixed to the distal end portion of the first operating shaft 16. A second pressing plate 19 having an annular pressing surface 19a opposite to the pressing surface 18a of the first pressing plate 18 in the direction of the branch axis Y is fitted on the distal end side, and the both pressing plates Between the pressing surfaces of 18 and 19, the expanded diameter larger than the inner diameter of the branch pipe 5 from the reduced diameter state smaller than the inner diameter of the branch pipe 5 due to the clamping action from the branch axis Y direction. By elastically deforming to a state, a rubber diameter-expanding elastic body 20 that blocks the flow path W in the branch pipe 5 is covered.

  The closing operation means C is an operation screw member that can abut on a base end portion of the first operation shaft 16 via a thrust bearing 21 on a screw shaft portion 17 a formed on the base end side of the second operation shaft 17. 22 is screwed together.

  When the operation screw member 22 is screwed to the tightening side, as shown in FIG. 9, the first operation shaft 16 is pushed and slid to the distal end side with respect to the second operation shaft 17, and the second pressing plate 19. Due to the clamping action accompanying the proximity movement of the pressing surface 18a of the first pressing plate 18 with respect to the pressing surface 19a, the diameter-expanding elastic body 20 in the reduced diameter state expands to an outer diameter larger than the inner diameter of the branch pipe 5. It can be elastically deformed into a radial state, and the flow path W in the branch pipe 5 can be shut off in a watertight (sealed) state.

  The fixture 9 and the support arm 10 are configured in a split structure that can be fixedly attached to the support 8 and the first operating shaft 16 of the closing device B from the outside in the radial direction, and are provided in the fixture 9. The first operation shaft 16 of the closing device B can be detachably tightened and fixed by rotating the screw-type tightening operation knob 9a.

  Further, as the nut 4 for attaching the support arm 10 to the support 8, when the support 8 is required to be retrofitted, the nut 4 having a split structure that can be fixedly attached to the support 8 from the outside in the radial direction. Use it.

[2] As shown in FIG. 3, the opening / closing operation shaft 6A of the gate valve 6 is operated to the valve opening side to switch the valve body 6B at the valve closing position to the valve opening position, and then the fixing tool 9 when the closing operation knob 9a is loosened and the closing device B is pushed against the water pressure, and when the closing portion A passes through the branch palate 2B of the branch base 2 and enters the branch base 2A. The operation screw member 22 of the closing operation means C is screwed to the tightening side, and is compressed by the clamping action accompanying the proximity movement of the pressing surface 18a of the first pressing plate 18 to the pressing surface 19a of the second pressing plate 19. The diameter-enlarging elastic body 20 in the diameter state is elastically deformed to a diameter-expanding state larger than the inner diameter of the branch pipe 5.
In this case, since the diameter-expanding elastic body 20 is expanded in the internal space of the branch base portion 2 that has passed through the branch pipe 5, the diameter-expanding elastic body 20 is expanded in the middle of the branch pipe 5. The operating force can be reduced as compared with the case of doing so.

  In this state, when the closing device B is moved upward along the branch axis Y direction, water pressure is also applied, and the diameter-enlarging elastic body 20 of the closing portion A is moved from the branch axis Y direction with respect to the opening periphery of the branch pipe 5. The flow path W in the branch pipe 5 can be blocked in a watertight (sealed) state, and the flow path is blocked in the first operation shaft 16 by the tightening operation of the tightening operation knob 9 a of the fixture 9. Maintain by tightening.

  Further, in this tightening operation state, the support arm 10 is lifted by the nut 4 screwed to the support column 8, so that the elastic body 20 for expanding the diameter of the closed portion A is further pressed against the peripheral edge of the opening of the branch pipe 5. The flow path blocking performance is enhanced. That is, the nut 4 threadedly engaged with the support column 8 extends the diameter-enlarging elastic body 20 of the closed portion A in an expanded state with respect to the opening periphery of the branch pipe 5 facing the inner space of the branch base portion 2. It is comprised by the pressurization operation means for making it press-contact from a core direction.

[3] As shown in FIG. 4, when the flow passage blocking process by the closing portion A of the closing device B is completed, the connecting flange portion 5a of the branch pipe 5 and the lower connecting flange portion 6a of the gate valve 6 are connected. Both the connecting flanges formed by this disengagement movement are performed by releasing the fixing bolts 3 and nuts 4 and releasing the lower connecting flange portion 6a of the gate valve 6 upward from the connecting flange portion 5a of the branch pipe 5. Through the space between the parts 5a and 6a, a support arm 10 provided with another fixture 9 is installed on the support column 8, and the first operating shaft 16 of the closing device B is fastened and fixed by the fixture 9 of the support arm 10, The flow path blocking state by the blocking portion A of the blocking device B is maintained.

[4] As shown in FIG. 5, the support arm 10 having the fixture 9 positioned on the upper side is removed from the support column 8, and the blocking case is maintained while the blocking state of the blocking unit A of the blocking device B is maintained. 15 and the gate valve 6 are removed from the first operating shaft 16 of the closing device B.
Thereafter, an intermediate portion of the branch pipe 5 that is downstream from the closing position of the closing portion A and upstream from the connecting flange portion 5a is along a direction orthogonal to the branch axis Y. It cuts and separates by a known cutting device, and the cutting and removing tube portion 5B is removed from the remaining branch tube portion 5A that is left on the branch port lid 2B side of the branch base portion 2.

[5] When the dividing step of the branch pipe 5 is completed, as shown in FIG. 6, a new metal branch member 25 capable of covering the outside of the entire remaining branch pipe portion 5A after the division, Of the pedestal case portion 25A having an inner diameter larger than the outer diameter of the remaining branch pipe portion 5A and an inner height larger than the protruding height of the remaining branch pipe portion 5A, and the ceiling wall portion of the pedestal case portion 25A, Of the new branch member 25 formed integrally with the remaining branch pipe part 5A and the branch pipe part 25B having the same diameter which are continuously provided in a state of opening at a portion opposite to the cutting opening end face of the remaining branch pipe part 5A. Of these, the connecting flange portion 12a on the lower side (upstream side) of the new gate valve 12 is connected to the connecting flange portion (an example of the connecting portion) 25b formed on the branch connection port 25a side of the branch pipe portion 25B with a bolt 3. It is fixedly connected in a watertight state via the nut 4, and The connecting flange portion 12b on the upper side (downstream side) of the new gate valve 12 is fixedly connected to the connecting flange portion 15a of the closing case 15 through a bolt 3 and a nut 4 in a watertight state. The object is assembled to the first operating shaft 16 of the closing device B.

[6] As shown in FIG. 7, a support arm 10 provided with another fixture 9 is installed on the top of the support column 8, and the first operating shaft 16 of the closing device B is secured by the fixture 9 of the support arm 10. Is tightened and fixed to maintain the flow path blocking state by the closing portion A of the closing device B, and the lower support arm 10 is removed from the first operating shaft 16 of the closing device B.

  A single unit fixedly connected along the first operating shaft 16 of the closing device B is lowered to connect the base case portion 25A of the new branch member 25 located at the lowermost portion thereof to the branch connection of the branch pipe portion 25B. Placed on the upper surface of the branch lid 2B of the branch base 2 with the opening 25a facing the cutting opening of the remaining branch pipe portion 5A, the lower end of the base case portion 25A and the branch lid 2B are in close contact with each other by welding all around. Install with.

[7] As shown in FIGS. 7 and 8, the operating screw member 22 of the closing operation means C is screwed to the loose side, and the first pressing plate against the pressing surface 19a of the second pressing plate 19 of the closing portion A. After elastically deforming the diameter-expanding elastic body 20 in a diameter-expanded state to a diameter-reduced state smaller than the inner diameter of the branch pipe 5 by the clamping pressure release action accompanying the separation movement of the pressing surface 18a of 18 The closed portion A is moved up into the closed case 15 through the new gate valve 12 in the open state.
Next, the opening / closing operation shaft 12A of the new gate valve 12 is operated to the valve closing side to switch the valve body 12B at the valve opening position to the valve closing position, and then the upper connecting flange portion of the new gate valve 12 is operated. 12b and the connecting flange portion 15a of the closing case 15 are released, and the closing case 15 and the closing portion A of the closing device A are removed from the new gate valve 12, and the support column 8 is also removed. The bolt 3 and nut 4 are replaced, and the connecting flange portion 13a of the new air valve 13 is fixedly connected to the upper connecting flange portion 12b of the new gate valve 12 in a watertight manner via the bolt 3 and nut 4.

  In the first embodiment described above, the new gate valve 12 and the new air valve 13 are replaced. However, the removed gate valve 6 and the air valve 7 operate normally, and there is a margin in the durability. The gate valve 6 and the air valve 7 may be reused as they are.

  In the first embodiment described above, the branch base 2 is connected to the cylindrical branch base 2A protruding in the middle of the water pipe 1 and the connection flange portion 2a in a watertight state. It is composed of a palate 2B, and one end of a branch pipe 5 is connected to the branch palate 2B. If the branch pipe 5 is provided directly in the middle of the water pipe 1, the branch pipe 5 and the branch pipe 2 are branched. The branch base 2 for connecting and forming the branch pipe 5 to the water pipe 1 is formed with a connection point with one end of the pipe 5.

[Second Embodiment]
In the first embodiment described above, as shown in FIG. 5, an intermediate portion of the branch pipe 5 that is downstream from the closing position of the closing portion A and upstream from the connecting flange portion 5a, Although the dividing step of cutting and separating along the direction orthogonal to the branch axis Y is adopted, such a dividing step may be omitted.
That is, as shown in FIG. 10, a new metallic branch member 26 capable of covering the outside of the entire branch pipe 5 including the connection flange portion 5a, more specifically, than the outer diameter of the connection flange portion 5a. Of the pedestal case portion 26A provided with a large inner diameter and an inner height greater than the protruding height of the branch pipe 5, and in a portion of the ceiling wall portion of the pedestal case section 26A facing the opening end face of the branch pipe 5 Of the new branch member 26 formed integrally with the branch pipe 5 and the branch pipe portion 26B having the same diameter that are continuously provided in an open state, the branch pipe portion 26B is formed on the branch connection port 26a side. A connection flange portion 12a on the lower side (upstream side) of the new gate valve 12 is fixedly connected to the connection flange portion (an example of the connection portion) 26b in a watertight state via bolts 3 and nuts 4, and the new partition Connecting valve on the upper side (downstream side) of the valve 12 A connecting flange portion 15a of the closing case 15 is fixedly connected to the lunge portion 12b in a watertight state via bolts 3 and nuts 4, and this fixedly connected unit is assembled to the first operating shaft 16 of the closing device B. wear.

  In FIG. 6 of the first embodiment, a support arm 10 provided with another fixture 9 is installed on the column 8 over the lower portion of the column 8, and the first of the closing device B is fixed by the fixture 9 of the support arm 10. The operation shaft 16 is fastened and fixed to maintain the flow path blocking state by the closing portion A of the closing device B. However, as shown in FIG. If the engagement force with the opening periphery of the pipe 5 is strong and the flow path W in the branch pipe 5 can be maintained in a watertight (sealed) state, even if the fixing maintenance action by the fixture 9 of the support arm 10 is omitted. Good.

  Next, as shown in FIG. 11, a support arm 10 provided with another fixture 9 is installed on the upper side of the support column 8, and the first operating shaft 16 of the closing device B is secured by the fixture 9 of the support arm 10. Is tightened and fixed, and the flow path blocking state by the closing portion A of the closing device B is maintained.

A single unit fixedly coupled along the first operating shaft 16 of the closing device B is lowered to connect the base case portion 26A of the new branch member 26 located at the lowermost portion thereof to the branch connection of the branch pipe portion 26B. The mouth 26a faces the opening of the branch pipe 5 and is placed on the upper surface of the branch mouth lid 2B of the branch base 2, and the lower end of the base case portion 26A and the branch mouth lid 2B are attached in close contact by all-around welding.
Since the subsequent steps are the same as those described in [7] of the first embodiment, description thereof is omitted.

[Third Embodiment]
FIG. 12 shows a fluid piping structure in which an air valve 7 as an example of a fluid device is connected to a metal branch pipe 5 of a branch system in the fluid piping system, and is an example of a fluid pipe constituting the fluid piping system. In the middle of the water pipe 1, the branch pipe 5 is integrally formed so as to project radially outward along a branch axis Y perpendicular to the pipe axis X, and one end of the branch pipe 5 is formed. A connecting portion between the water pipe and the water pipe 1 is formed in the branch base 2.

  In addition, a connecting flange portion (an example of a connecting portion) 5a on the other end side of the branch pipe 5 includes a bolt 3. A bolt that is fixedly connected in a watertight state via a nut 4 and is connected to an upper (downstream) connection flange portion 6b of the gate valve 6 is a connection flange portion 7a of the air valve 7 as an example of a fastening means. 3. It is fixedly connected in a watertight state via a nut 4.

  Next, in the above-described fluid piping structure, the branch pipe 5 in which leakage has occurred at the branch base portion 2 which is a connection portion between the one end portion of the branch pipe 5 and the water pipe 1 is replaced with clean water (fluid) in the water pipe 1. A branch pipe renewal method for a fluid piping system that is renewed while maintaining transportation will be described.

  [1] As shown in FIGS. 12 and 13, the gate valve 6 is maintained in a closed state, and the upper connection flange portion 6b of the gate valve 6 and the connection flange portion 7a of the air valve 7 are fixedly connected. The bolt 3 and the nut 4 are fixed and released, and the air valve 7 is removed from the upper connection flange portion 6b of the gate valve 6, and water flowing out from the branch base portion 2 at a predetermined location is also provided. Attach the drainage hose 30 to guide the drainage.

  [2] As shown in FIG. 14, the outer peripheral surface of the branch pipe 5 is provided with a through hole 31a that can be attached to the outer peripheral surface of the connecting flange portion 5a of the branch pipe 5 and excluding the connecting surface of the connecting flange portion 5a. A metal branch sealing member 31 capable of sealing the side, specifically, a ceiling wall forming plate portion 31A having a through hole 31a having an inner diameter slightly larger than the outer diameter of the connecting flange portion 5a, and the ceiling wall forming plate portion A branched sealing member having a split structure in which a peripheral wall forming plate portion 31B that seals the outer side of the outer peripheral surface of the branch pipe 5 is integrally formed in a state where the upper surface of 31A and the connecting surface of the connecting flange portion 5a are flush with each other. 31, an arc-shaped cutout portion 31 b along the outer peripheral surface of the water pipe 1 is formed in the lower portion of the peripheral wall forming plate portion 31 </ b> B.

  And the notch part 31b of the surrounding wall formation board part 31B of the said branch sealing member 31 is applied to the outer peripheral surface of the water pipe 1, and the abutting location is attached in a close contact state by all-around welding, and the said branch sealing member 31 is attached. The inner peripheral surface of the through-hole 31a in the ceiling wall forming plate portion 31A and the outer peripheral surface of the connecting flange portion 5a of the branch pipe 5 are joined in close contact by all-around welding.

  The drain hose 30 is led out to the outside through a lead-out port 31c formed in the ceiling wall forming plate portion 31A of the branch sealing member 31.

  [3] As shown in FIG. 15, an example of a solidifying filler in the sealed space S formed between the outer peripheral surface of the water pipe 1, the outer peripheral surface of the branch pipe 5, and the inner surface of the branch sealing member 31. The mortar (for example, jet mortar) 32 is filled, and a storage recess 34 for storing the drainage hose 30 stopped by the hose cap 33 in a portion of the mortar 32 corresponding to the outlet 31c. Form.

And by the mortar 32 which is an example of the solidification filler inject | poured in the sealed space S formed between the outer peripheral surface of the said water pipe 1, the outer peripheral surface of the branch pipe 5, and the inner surface of the branch sealing member 31 Further, the branch port forming portion of the water pipe 3 can be firmly reinforced with the branch sealing member 31 and the solidified mortar 32, and corrosion caused by leakage of clean water into the sealed space S can be suppressed. it can.
In addition to the mortar, the filler 32 may be a cement paste or an epoxy resin that is liquid and solidifies over time.

  [4] As shown in FIG. 16, the upper connecting flange portion 6b of the gate valve 6 includes a closing portion (closing means) A capable of closing the flow path W of the branch pipe 5, and is a constituent member of the closing device B. The connecting flange portion 15a of the bottomed cylindrical closing case 15 in which the first operation shaft 16 is inserted and supported in the bottom wall portion 15b is fixedly connected with the bolt 3 and the nut 4 in a detachable manner.

  As the closing device B, there are conventionally various types of structures. As an example, as shown in FIGS. 12 to 20, a bolt 3 and a nut are provided with respect to the upper connecting flange portion 6 b of the gate valve 6. 4, the bottom wall portion 15b of the bottomed cylindrical closure case 15 provided with a connecting flange portion 15a that is detachably fixedly connected to the center wall of the bottom wall portion 15b is slid in the direction of the branch axis Y in a watertight state. A cylindrical first operation shaft 16 that movably penetrates and a second operation shaft 17 that slidably penetrates in the first operation shaft 16 in the direction of the branch axis Y are provided. 16 and the distal end side of the second operating shaft 17 are a closed portion A for blocking the flow path W in the branch pipe 5, and a large-diameter pipe wall portion upstream from the shielding portion by the closed portion A, that is, , While bending in a diameter-enlarging posture that can be engaged with the peripheral edge of the branch channel opening of the water pipe 1 A retaining means D having a pair of locking links 35 and 36 is provided, and an operating means E for operating the closing portion A and the retaining means D from the outside via both operating shafts 16 and 17 is provided. It has been.

  As shown in FIG. 20, the retaining means D is pivotally connected to a plurality of locations in the circumferential direction on the upstream end surface of the second pressing plate 19 so that the ends of the downstream locking links 36 are swingable. The plate-like connecting portion 37 is fixed, and there are a plurality of circumferential positions on the outer peripheral surface of the mounting cylinder 38 that is slidably fitted to the distal end side screw shaft portion 17b of the second operation shaft 17. Further, a plate-like connecting portion 39, to which the end portion of the locking link 35 on the upstream side is pivotally connected so as to be swingable, is fixed, and further, the maximum movement of the mounting cylinder 38 relative to the second operating shaft 17 to the upstream side. A stopper nut 40 for setting the position is screwed to the distal end side of the distal end side screw shaft portion 17 b of the second operation shaft 17.

  Of the connecting portion 37 of the second pressing plate 19 and the connecting portion 39 of the mounting cylinder 38, the pair of locking links 35 and 36 are pivoted over the connecting portions 37 and 39 of the pair facing each other in the axial direction. As shown in FIG. 20, the shield is connected to the first operating shaft 16 by sliding toward the base end side (upper side) of the second operating shaft 17 and is shielded by the diameter-enlarging elastic body 20. It is constructed so as to project while being bent in a diameter-enlarging posture that can be engaged with the inner peripheral wall surface on the upstream side, that is, the peripheral edge of the branch channel opening of the water pipe 1.

  As shown in FIG. 20, the operating means E has a threaded shaft portion 17 a formed on the proximal end side of the second operating shaft 17 and a thrust bearing 42 on the end portion of the first operating shaft 16. A contactable operation screw member 43 is screwed.

  When the operation screw member 43 is screwed to the tightening side, the first operation shaft 16 is pushed and slid to the inner end side with respect to the second operation shaft 17, and the first pressing plate 18 against the second pressing plate 19. The elastic body 20 for expanding the diameter in an uncompressed state is elastically deformed into a diameter-expanding state in close contact with the inner peripheral wall surface of the branch pipe 5 due to the pinching action accompanying the close movement of the flow path W. Is closed in a watertight state.

  A first presser operating lever 44 is detachably fitted and held at the base end (upper end) of the first operating shaft 16. The first presser operating bar 44 has a second operating shaft. The second presser operating rod 45 detachably fitted and held at the base end portion (upper end portion) of 17 can be freely engaged and disengaged, and in the engaged state, the first press shaft 16 against the first operating shaft 16 can be resisted against water pressure. 2 A pair of first locking rings 46 for preventing the operation shaft 17 from sliding toward the proximal end side, and a pair of L-shaped locking pieces 47 fixed to the bottom wall portion 15 b of the closing case 15. A pair of second locking rings 48 that are detachable and that prevent sliding of the first operating shaft 16 toward the proximal end side with respect to the closing case 15 against water pressure in the engaged state are provided.

Then, after operating the opening / closing operation shaft 6A of the gate valve 6 to the valve opening side to switch the valve body 6B at the valve closing position to the valve opening position, both operation shafts 16, 17 of the closing device B are operated. Is pushed downward with respect to the closing case 15 and the pair of second locking rings 48 are engaged with both locking pieces 47 of the closing case 15 to hold the operating shafts 16 and 17 in the pressing operation position. .
At this time, the retaining means D is located in the water pipe 1 having a larger cross-sectional area than the flow path W in the branch pipe 5.

  Next, when the pair of first locking rings 46 are removed from the second presser operation rod 45 and the second presser operation rod 45 is removed from the second operation shaft 17, the water pressure of the tap water flowing through the water pipe 1 or this The second operating shaft 17 slides to the base end side (upper side in the figure) with respect to the first operating shaft 16 by the water pressure and the artificial pulling operation force, and in conjunction with this, the second pressing plate 19 A pair of locking links 35 and 36 that are pivotally connected across the connecting portion 37 and the connecting portion 39 of the mounting cylinder 38 protrude while bending in a diameter-enlarging posture.

  In this state, both the second locking rings 48 are removed from both locking pieces 47 of the closing case 15, and both operating shafts 16 and 17 are closed by the water pressure of tap water or this water pressure and an artificial pulling operation force. When sliding upward with respect to the case 15, the pair of locking links 35, 36 bent in the diameter-enlarging posture is the inner peripheral wall surface upstream of the flow path shielding portion by the diameter-enlarging elastic body 20, that is, water supply Engage with the peripheral edge of the branch channel opening of the tube 1.

  When the operation screw member 43 is artificially screwed to the tightening side, the first operation shaft 16 is pushed and slid to the inner end side (the lower side in the drawing) with respect to the second operation shaft 17, and the second pressure plate As a result of the clamping action accompanying the proximity movement of the first pressing plate 18 with respect to 19, the diameter-expanding elastic body 20 in the reduced diameter state is elastically deformed into a diameter-expanding state in close contact with the inner peripheral wall surface of the branch pipe 5. The flow path W of 5 is interrupted.

  [5] As shown in FIG. 17, the first presser foot 44 and the first presser foot 44 while the closing part A and the retaining means D of the closing device B are left in the closed state. And the gate valve 6 and the closing case 15 are removed from the connecting flange portion 5 a of the branch pipe 5.

  [6] As shown in FIG. 18, the new branch member 50 covering the outer side of the branch port of the branch pipe 5, more specifically, has an inner diameter larger than the outer diameter of the connecting flange portion 5a of the branch pipe 5. A pedestal case portion 50A, and a branch pipe portion 50B having the same diameter as the branch pipe 5 continuously provided in a state of opening in a portion facing the branch port of the branch pipe 5 among the ceiling wall portion of the pedestal case portion 50A A new branch member 25 is prepared, and a new branch valve 12 is provided on a connection flange portion (an example of a connection portion) 50b on the branch connection port 50a side of the branch pipe portion 25B of the new branch member 25. After the lower (upstream) connecting flange portion 12a is fixedly connected in a watertight state via bolts 3 and nuts 4, or before the gate valve 12 is fixedly connected, the base case portion of the new branch member 25 is provided. 50A, its branch connection port 50a In a state of communicating with the branch port of the branch pipe 5, it is applied to the upper surface of the ceiling wall forming plate portion 31A of the branch sealing member 31, and all the contact points between the base case portion 50A and the ceiling wall forming plate portion 31A are placed. Install in close contact by circumferential welding.

  Next, the connection flange portion 15a of the closing case 15 is fixedly connected to the connection flange portion 12b on the upper side (downstream side) of the new partition valve 12 in a watertight state via bolts 3 and nuts 4, and the new partition valve 12 is connected. After operating the opening / closing operation shaft 12A of the valve 12 to the valve opening side and switching the valve body 12B at the valve closing position to the valve opening position, the operation means E of the closing device B is operated to close the closing means. The diameter-enlarging elastic body 20 and the locking links 35 and 36 of the retaining means D are reduced in diameter, and both operating shafts 16 and 17 are moved upward with respect to the closing case 15 to move the closing means A and the removal means. The stop means D is stored in the closing case 15 and the valve body 12B of the new gate valve 12 is closed.

[7] As shown in FIG. 19, after removing the closing case 15 of the closing device B from the downstream side connecting flange portion 12b of the new gate valve 12, the fluid is transferred to the downstream side connecting flange portion 12b of the new gate valve 12. A connecting flange portion (an example of a connecting portion) 7a of a new air valve 7 which is an example of an apparatus is tightened and connected with a bolt 3 and a nut 4 in a sealed state so as to be detachable.

In addition, in the said 3rd Embodiment, although the drainage hose 30 was attached to the water leak generation | occurrence | production location of the said branch base part 2, even if the water leak generation | occurrence | production site | part of the branch base part 2 is water-stop-processed with water-stopping materials, such as a putty for water stop, In addition, the water leakage occurrence location of the branch base 2 may be water-stopped by welding or the like.
In the case where the water stop treatment is performed by the water stop material or welding, a liquid is contained in the sealed space S formed between the outer peripheral surface of the water pipe 1 and the outer peripheral surface of the branch pipe 5 and the inner surface of the branch sealing member 31. After filling the mortar 32, the outlet 31c formed in the ceiling wall forming plate portion 31A of the branch sealing member 31 may be sealed with the plug 41 without waiting for the filling mortar 32 to solidify. Even in this case, since the filled mortar 32 is solidified with time, the reinforcing function and the corrosion inhibiting function by the filled mortar 32 are not affected.

[Fourth Embodiment]
FIGS. 21-23 shows the modification of the branch pipe update construction method of the fluid piping system in the above-mentioned 3rd Embodiment.
[1] As shown in FIGS. 12 and 21, the gate valve 6 is maintained in a closed state, and the upper connection flange portion 6b of the gate valve 6 and the connection flange portion 7a of the air valve 7 are fixedly connected. The air valve 7 is removed from the upper connection flange portion 6b of the gate valve 6 by releasing the fixing of the bolts 3 and nuts 4, and the flow path of the branch pipe 5 is connected to the upper connection flange portion 6b of the gate valve 6 A connecting flange of a bottomed cylindrical closure case 15 which is a constituent member of a closure device B having a closure portion (blocking means) A capable of closing W and in which the first operating shaft 16 is inserted and supported on the bottom wall portion 15b. The part 15a is fixedly coupled to the bolt 3 and the nut 4 in a detachable manner.

  Next, the opening / closing operation shaft 6A of the gate valve 6 is operated to the valve opening side to switch the valve body 6B at the valve closing position to the valve opening position, and then the both operation shafts 16, 17 is pushed and moved downward with respect to the closing case 15, the pair of second locking rings 48 are engaged with both locking pieces 47 of the closing case 15, and the operating shafts 16, 17 are held in the pressing operation position. Then, by operating the operating means E of the closing device B, the pair of locking links 35 and 36 bent in the diameter-enlarging posture are arranged on the inner peripheral wall surface on the upstream side of the flow path shielding portion by the diameter-enlarging elastic body 20. The branch pipe is engaged with the peripheral edge of the opening of the branch channel, and the elastic body 20 for expanding the diameter is elastically deformed so as to be in close contact with the inner peripheral wall surface of the branch pipe 5 to branch. The flow path W of the pipe 5 is blocked.

  [2] As shown in FIG. 22, the first presser foot 44 from the first operating shaft 16 and the second operating shaft 17 with the closing portion A and the retaining means D of the closing device B left in the closed state of the flow path. And the gate valve 6 and the closing case 15 are removed from the connecting flange portion 5 a of the branch pipe 5.

  Next, the water pipe 1 is divided into a plurality (three in this embodiment) in the pipe circumferential direction so as to be freely attachable from the outside in the pipe radial direction, and the connection is made to one of the divided joint bodies 55A. A new branch joint 55 provided with a branch cylinder portion 55B capable of covering and covering the outside of the entire branch pipe 5 including the flange portion 5a is prepared.

  At both ends in the circumferential direction of each split joint body 55A of the new branch joint 55, connection flange portions 55a are formed for fixed connection in a watertight manner with adjacent split joint bodies 55A via bolts 56 and nuts 57. In addition, an annular connecting flange portion 55b protruding outward in the radial direction is formed at the tip of the branch tube portion 55B.

  The new branch joint 55 is attached to the water pipe 1 in an exterior state in which the branch cylinder portion 55B covers the outside of the entire branch pipe 5, and the inner peripheral surface of the new branch joint 55 is connected to the water pipe. A space formed between the outer peripheral surface of the pipe 1 and the outer peripheral surface of the branch pipe 5 is filled with mortar (for example, jet mortar) 32 which is an example of a solidifying filler.

  [3] As shown in FIG. 23, a plate flange 58 provided with a through-hole 58a having the same diameter as the inner diameter of the branch pipe 5 in the connection flange portion 55b of the branch cylinder portion 55B of the new branch joint 55 in a watertight state. The lower flange (upstream side) of the new gate valve 12 is fixedly connected to the plate flange 58 in a watertight state via bolts 3 and nuts 4.

  Next, the connection flange portion 15a of the closing case 15 is fixedly connected to the connection flange portion 12b on the upper side (downstream side) of the new partition valve 12 in a watertight state via bolts 3 and nuts 4, and the new partition valve 12 is connected. After operating the opening / closing operation shaft 12A of the valve 12 to the valve opening side and switching the valve body 12B at the valve closing position to the valve opening position, the operation means E of the closing device B is operated to close the closing means. The diameter-enlarging elastic body 20 and the locking links 35 and 36 of the retaining means D are reduced in diameter, and both operating shafts 16 and 17 are moved upward with respect to the closing case 15 to move the closing means A and the removal means. The stop means D is stored in the closing case 15 and the valve body 12B of the new gate valve 12 is closed.

  After removing the closing case 15 of the closing device B from the downstream connecting flange portion 12b of the new gate valve 12, a new air valve 7 as an example of a fluid device is provided at the downstream connecting flange portion 12b of the new gate valve 12. The connecting flange portion (an example of the connecting portion) 7a is tightened and connected with a bolt 3 and a nut 4 in a sealed state so as to be detachable.

  In addition, since the other structure is the same as the structure demonstrated in 3rd Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) The branch pipe renewal method of the fluid piping system according to the present invention can be applied to rehabilitation of branch pipes (branch pipes) for various uses that are branched from the various fluid pipes 1.

Partially cutaway front view before construction showing a first embodiment of a branch pipe renewal method for a fluid piping system according to the present invention Partially cutaway front view of the main part showing the attachment process of the closure device Cross-sectional front view of the main part showing the closing process of the closing device Cross-sectional front view of the main part showing the removal process of the gate valve Cross-sectional front view of the main part showing the branching process of the branch pipe Partially cutaway front view of the main part showing the assembly process of the new branch member and the new gate valve Partially cutaway front view of the main part showing the installation process of the new branch member and the new gate valve Partially cutaway front view of the main part showing the installation process of the new air valve (A) is a partially cut-away private side view of the occlusion device with a reduced diameter, and (B) is a partially cut-away private view of the occlusion device with an expanded diameter. The 2nd Embodiment of the branch pipe renewal construction method of the fluid piping system by this invention is shown, The partially cutaway front view of the principal part which shows the assembly process of a new branch member and a new gate valve Partially cutaway front view of the main part showing the installation process of the new branch member and the new gate valve Partially cutaway front view before construction showing a third embodiment of a branch pipe renewal method for a fluid piping system according to the present invention Partial cutaway front view of the main part showing the drain hose connection process Partial cutaway front view of the main part showing the installation process of the branch sealing member Front view of part of the main part showing the mortar filling process Partially cutaway front view of the main part showing the closing process by the closing device Partially cutaway front view of the main part showing the removal process of the gate valve Partially cutaway front view of the main part showing the installation process of the new branch member and the new gate valve Partially cutaway front view of the main part showing the installation process of the new air valve (A) is a partially cut-away private plan view of the occlusion device in a reduced diameter state, (B) is a partially cut-away private view of the occlusion device in an expanded state. The 4th Embodiment of the branch pipe renewal construction method of the fluid piping system by this invention is shown, The partially notched front view of the principal part which shows the obstruction | occlusion process by the obstruction | occlusion apparatus Partially cut away front view showing the assembly process of the new branch joint, the mortar filling process, the removal process of the gate valve Partially cutaway front view of the main part showing the installation process of the new gate valve

Explanation of symbols

A Blocking part B Closing device S Sealing space W Channel 1 Fluid pipe (water pipe)
2 Branch base 5 Branch pipe 5a Connection part (connection flange part)
12 New gate valve 25 New branch member 25a Branch connection port 26 New branch member 26a Branch connection port 31 Branch sealing member 32 Filler (mortar)
50 New branch member 50a Branch connection port 55 New branch joint 55A Split joint body 55B Branch cylinder part

Claims (6)

A branch of a fluid piping system that renews a branch pipe having one end connected to a branch base of the fluid pipe and a gate valve connected to a connecting portion formed at the other end while maintaining fluid transportation in the fluid pipe. A pipe renewal method, comprising the following steps 1) to 4): A branch pipe renewal method for a fluid piping system.
1) A closing device having a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is connected by the closing part of the closing device inserted through the gate valve in the opened state. Block.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) After dividing the branch pipe at a site downstream of the blocking action position of the blocking section and upstream of the connecting section, the fluid pipe or the branch base is cut into the cutting opening of the remaining branch pipe section after the cutting. A new branch member having a branch connection port that communicates and capable of covering and covering the entire outside of the remaining branch pipe portion is attached in close contact.
4) After connecting the gate valve to the connecting portion formed on the branch connection port side of the new branch member, the blocker of the blocker is removed through the gate valve in the valve open state. A branch of a fluid piping system that renews a branch pipe having one end connected to a branch base of the fluid pipe and a gate valve connected to a connecting portion formed at the other end while maintaining fluid transportation in the fluid pipe. A pipe renewal method, comprising the following steps 1) to 4): A branch pipe renewal method for a fluid piping system.
1) A closing device provided with a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing part of the closing device inserted through the gate valve in the opened state. To do.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) The fluid pipe or the branch base is provided with a branch connection port communicating with the branch port of the branch pipe, and a new branch member capable of covering the outside of the entire branch pipe including the connection portion is in close contact with the fluid pipe or the branch base. Install with.
4) After connecting the gate valve in close contact with the connecting portion formed on the branch connection port side of the new branch member, the blocking portion of the closing device is removed through the gate valve in the valve open state. A branch pipe having one end connected to a fluid pipe or a branch base connected to the fluid pipe and a gate valve connected to a connecting portion formed at the other end is updated while maintaining fluid transportation in the fluid pipe. A branch pipe renewal method for a fluid piping system, comprising the following steps 1) to 5):
1) A branch sealing member that has a through-hole that can be attached to the outer peripheral surface of the connecting portion, and that can seal the outer peripheral surface side of the branch pipe excluding the connecting surface of the connecting portion, with respect to the fluid pipe or the branch base portion. Are attached in close contact with each other, and the space between the inner peripheral surface of the through hole of the branch sealing member and the outer peripheral surface of the connecting portion is sealed.
2) A closing device provided with a closing portion capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing portion of the closing device inserted through the gate valve in the opened state. To do.
3) The gate valve is removed from the connecting portion of the branch pipe while the closed portion of the closing device remains in the branch pipe.
4) A new branch member that covers the outer side of the branch port of the branch pipe is attached to the branch sealing member in a close contact state with its branch connection port communicating with the branch port of the branch pipe.
5) After connecting the gate valve to the connecting portion formed on the branch connection port side of the newly installed branch member, the closing portion of the closing device is removed through the gate valve in the open state. A branch pipe renewal method for a fluid pipe system in which a branch pipe having one end connected to a fluid pipe and a gate valve connected to a connecting portion formed at the other end is updated while maintaining fluid transportation in the fluid pipe. A branch pipe renewal method for a fluid piping system comprising the following steps 1) to 4):
1) A closing device having a closing part capable of closing the flow path of the branch pipe is connected to the gate valve, and the flow path in the branch pipe is closed by the closing part of the closing device inserted through the gate valve in the opened state. Occlude.
2) The gate valve is removed from the connecting part of the branch pipe while the closed part of the closing device remains in the branch pipe.
3) The fluid pipe is divided into a plurality of pipe circumferential directions so that the fluid pipe can be mounted from the outside in the radial direction of the pipe, and one of the divided joint bodies can cover the outside of the entire branch pipe. The new branch joint provided with the branch cylinder part is attached to the fluid pipe in a close contact state with the branch cylinder part covering the outside of the entire branch pipe.
4) After connecting the gate valve to the connecting portion formed in the branch cylinder portion of the new branch joint, the block portion of the block device is removed through the gate valve in the valve open state.   Before connecting a gate valve to the branch port of the branch sealing member, a filler is filled in an annular sealed space formed between the inner peripheral surface of the branch sealing member and the outer peripheral surface of the branch pipe. The branch pipe renewal method of the fluid piping system according to claim 3.   5. A filler is filled in an annular space between an inner peripheral surface of the new branch member and an outer peripheral surface of the branch pipe before connecting a gate valve to the branch port portion of the new branch member. The branch pipe renewal method for the fluid piping system described.

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